This sample showcases the new In-Memory OLTP feature, which is part of SQL Server 2014. It shows the new memory-optimized tables and natively-compiled stored procedures, and can be used to show the performance benefit of in-memory OLTP.
The installation instructions and documentation for this sample can be found on Books Online
Update (Apr 28, 2014): Fixed an issue where the isolation level for sample stored procedures demonstrating integrity checks was too low. The transaction isolation level for the following stored procedures was updated: Sales.uspInsertSpecialOfferProduct
inmem, and Production.uspDeleteProduct
You can ask a question about this sample at the SQL Server Samples Forum